Rear wheel cylinders and shoes

[jned2]

I've got a leaking driver side rear wheel cylinder on my S3. Looking for confirmation that it's a standard Sierra 2.0 petrol or 2.3 diesel that I need as a replacement - Lucas 64677523 and shoes are S28J 10031 or Ferodo F5B176A? Also what are your thoughts on replacing both, although only the one appears to be leaking. Many thanks.

[jned2]

Lewdon, many thanks. Quick update replaced both rear brake cylinders and shoes; cylinders were £25.98 for the pair from Eurocarparts (part no. 134590058) and the shoes were £18 from GSF (Ford Sierra 2.0 petrol).